1. Department of Materials Science and Engineering and The Shenzhen Key Laboratory for Printed Organic ElectronicsSouthern University of Science and Technology (SUSTech) No. 1088, Xueyuan Road Shenzhen Guangdong 518055 China
2. Institute of Polymer Optoelectronic Materials and DevicesState Key Laboratory of Luminescent Materials and DevicesSouth China University of Technology Guangzhou Guangdong 510640 China
3. Research Institute for Natural SciencesDepartment of ChemistryKorea University Seoul 136‐713 South Korea